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| D254808 | Meldahl | Apr 1980 | S |
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| 5577514 | Zimmerman | Nov 1996 | A |
| 5623945 | Shecterle et al. | Apr 1997 | A |
| 5836307 | Scholl | Nov 1998 | A |
| 5836308 | Alla et al. | Nov 1998 | A |